Research Library

Experimental Summaries - Research Research Publications

1987

Control of four o'clock ( purpurea) in cereals.

J. R. Peirce

B. J. Rayner

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Part of the Agronomy and Crop Sciences Commons, Soil Science Commons, and the Weed Science Commons

Recommended Citation Peirce, J R, and Rayner, B J. (1987), Control of four o'clock (Oxalis purpurea) in cereals.. Department of Primary Industries and Regional Development, Western , Perth. Report.

This report is brought to you for free and open access by the Research Publications at Research Library. It has been accepted for inclusion in Experimental Summaries - Plant Research by an authorized administrator of Research Library. For more information, please contact [email protected]. Trial Title: Control of Four O'clock (Oxalis purpurea) in cereals.

Trial Number: 87KA85

Location: Tambellup - K. Hams

Soil Type: Sand

Blanket Treatments: Sown to oats

Ground Preparations:

Experimental Design:

Application Record:

Sprayed: 13/8/87

Time: 1.30-3.20 p.m.

Spray Vehicle: Motor bike

Nozzle Type: 80015LP

Pressure (kPa): 125

Volume of Application (L/ha): 78

Speed of Spraying (km/hr): 8

Wind Speed (km/hr): 3-8 (SW)

Temp. Dry Bulb (°C): 14

Wet Bulb (°C): 11

Relative Humidity:

Soil Surface: Dry

At Depth: Damp

Stage of Crop: Z13.7/22

Stage of Weeds:

-21- Table 16. 87KA85 Control of Four O'clock (Oxalis purpurea) in cereals

Treatment Rate/ha % Control % Crop Yield Four damage t/ha O'clock

1 Sencor 300 g (product) 49 23 717 2 Sencor + Ally 200 g + 2.5 g 39 5 670 3 Logran 25 g 74 51 917 4 Logran 40 g 84 67 909 5 Logran + Ally 25 g + 200 g 88 77 650 6 Logran + Sencor 25 g + 200 g 73 25 785 7 Sencor + Isoproturon 200 g + 2 L 78 55 670 8 Logran + Isoproturon 25 g + 2 L 82 29 809 9 Isoproturon 2 L 50 19 749 10 Ally 5 g 83 65 737 11 Meteor* 1 kg 61 19 829 12 Brodal 150 ml 34 8 849 13 Nil 2 2 725

* Meteor is a mixture of Sencor (Metribuzin) & Dosanex (Metoxuron).

Because of the late dry season, yields were below expected. Under these vioucti dalmaywo 4=Lv.Lded LlivLc ww1.= hiyh L4up eacly afte,: th6 treatments applied. Logran 25 & 40 g, did not reflect any yield loss. The control of the weed will be assessed in 1988 from plant counts of bulbs sprouting after the break of the season.

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